In spite of the change, nobody calls E5 to gasoline 95 or E10 to gasoline 98. For now, everyone keeps the denomination “of a lifetime,” and we still hear many comments of type “my car goes much better with 98 gasoline” or even “compensates me for the difference in price because my car spends much less than with 95 gasoline”.
Is that true or the fact of paying more makes us run more (and it gives us the feeling that the car is running more) or we are more restrained with the accelerator, that is why we have paid more, and that is why the car consumes less? You will also hear that disregarding the difference in cost; you will obtain better performance and theoretically greater mechanical durability since the fuel at the chemical level is better. All this is very debatable.
The most notable difference and that we can all certify when we approach a service station is a price. We have taken a look at the portal of the Ministry of Ecological Transition and, in Madrid and 2019 the difference is remarkable.
14% overpayment is a very high amount. Is it justified? Worth? Well, as a good Galician, I will answer that it depends. It is better to inform you of the benefits of using one fuel over another and if it can compensate you.
Where is the difference?
Between one fuel and another, there is three octane difference. When we talk about octane referring to fuel, we mean its resistance to self-detonation, to self-ignition, which is higher in 98 octane gasoline.
When the gasoline reaches the combustion chamber, where it is mixed with air at very high pressure, in a very short time (compression phase), it must ignite, using the spark plug spark, at the precise moment. The gasoline of 98 is better for that because of its higher octane rating. Still, then each mechanic has been thought of differently, with different compression ratios, which is a number that allows measuring the proportion in volume in which the mixture of tablets has compressed. This figure indicates the degree of use of fuel energy.
If you hear about a very high compression engine (always referring to gasoline engines), you should likely use 98 octane gasoline. Using one with a lower octane could cause it to explode early, and the combustion was not adequate.
Do emissions pollute more than 95 gasoline?
Gasoline has sulfur, a dangerous component for the environment. Its percentage is higher in gasoline 95, hence at the moment, it is the minimum index that is allowed in Europe. It is the most used for its price, in addition to having other advantages, such as facilitating cold starting or its lower weight, being less dense.
In 2013, the European Union approved Directive 98/70 / EC, which seeks to increase the quality of gasoline and diesel. Then it was decided to ban 95 octane gasoline. Yes, fuel used by 3.5 million vehicles in Spain, and they have no alternative. There have been several extensions. The first extended its sale until 2016, the second until December 31, 2018, and the third until the end of 2019, just one more year. It remains to see if this extends.
What is the best gasoline for my car?
To know which gasoline is best for your car, you should read the manual. A team of engineers has developed the engine for a specific fuel. Our advice is that, unless the manufacturer expressly recommends 98 octane gasoline or prohibits that of 95 (it happened in the old FSI engines), the most sensible and economical thing is to use 95 octane gasoline.
And if I’m wrong refueling?
Normally all cars with gasoline engines accept both types of fuel, although the manufacturer recommends one or the other depending on the characteristics of the engine. All cars manufactured before the year 2000 use 95 gasoline and those sold after that date can use 95 or 98 gasoline interchangeably or only 98 gasoline. Knowing this:
All cars that recommend gasoline 95 can carry 98 without the mechanics suffering any damage (what you can notice is that you lose some power although the difference unless you drive a sports car, is almost negligible).
Is it possible to notice any changes? Yes, but especially in atmospheric engines or those with high performance, thanks to the high compression ratios.